Need to rebuild a reg on an 88/45.

Hey guys. I've gotta rebuild a reg on my buddies tank and it'll be my first time doing so. Any specific place I should order from? What kit should I get? I need the full deal, from what my local field tech says.
I don't yet know how to tell regs apart, so I've got some pictures up. Thanks y'all.

That's a pure energy reactor 2 regulator. It's very common and rebuild kits are easy to come by and your field should be able to order you one to be honest.
It shouldn't be anything more then changing the o-rings and some other seals, it's very straight forward to be honest. If you order the kit through your shop ask if they will do the repair/service for you. One of my local shops will do the service for free if you buy the product through them.

That's a pure energy reactor 2 regulator. It's very common and rebuild kits are easy to come by and your field should be able to order you one to be honest.
It shouldn't be anything more then changing the o-rings and some other seals, it's very straight forward to be honest. If you order the kit through your shop ask if they will do the repair/service for you. One of my local shops will do the service for free if you buy the product through them.

Thank you very much.

And now, if I didn't want to do this on my own, what companies rebuild regulators? My local fields tech is outta town for a little.